The motor that converts mechanical energy into DC energy is a DC generator; on the contrary, the motor that converts DC energy into mechanical energy is a DC motor.There are many types of DC motors. Figure 1-I is a cross-sectional view of the domestic Z2 series DC motor. As can be seen from the figure, all parts of the DC motor can be divided into two parts, fixed and rotating. The fixed part is called the stator, and the rotating part is called the rotor.